Abstract

Interpretation of 3D seismic data in KD-3D block has been largely handicapped due to the poor data quality. This article describes a reprocessing sequence of seismic data for improving imaging of Mesozoic sequences and igneous intrusive body. The area has shallow and relatively hard seafloor and Mesozoic sediment are covered by flood basalt. Conventional techniques such as Tau-P decon fails to remove surface multiples generated by seafloor. Surface related multiples elimination (SRME) cannot work due to lack of proper water bottom reflection energy even at near offset. Parabolic radon transform (PRT) is difficult to run due to uncertainty of primary velocity trend. On the other hand Tau-P hyperbolic velocity filtering (HVF) technique is highly capable to attenuate surface related multiples for such a complex scenario and helps to pick primary velocity with confidence. As a result, there is a significant improvement in imaging below the basalt.